well, i have same problem. How i can format sd cart while plugged in pc when my htc 8s can't see it. "SD not found". Format SD with using adapter on PC also don't work. Any other Ideas? SD is fine it works on other phones also i tried other SD and all of them don't work.

I had the same issue once on Android. There is this Panasonic Card Formatter on their website. Get the version 2. And try formatting it with that. Also, may be specific brands only work. Like I heard Kingston doesn't work on all phones. Try contacting HTC and ask them.

Also tried and still not working but, maybe that second thing is my problem. I have 8GB SD card made by "no name" ^^. The best card what I tried was 4th class but I cant remember who made it...
I wrote to HTC and they said that i should try SD card from their official partner (they offer 10th class card ~30-40$) but is strange that card which was recently formated on PC doesn't work oO, or try to give back it on guarantee to official HTC distributor... Great, new phone which needs to be repair. Good job.

Also tried and still not working but, maybe that second thing is my problem. I have 8GB SD card made by "no name" ^^. The best card what I tried was 4th class but I cant remember who made it...
I wrote to HTC and they said that i should try SD card from their official partner (they offer 10th class card ~30-40$) but is strange that card which was recently formated on PC doesn't work oO, or try to give back it on guarantee to official HTC distributor... Great, new phone which needs to be repair. Good job.

no I didn't. i have to send back my htc to repair probably bcs all of solution which you wrote won't work with my phone :/
I don't want to buy a new SD card without any "hardware" check and have same trouble with it...

I am also having problems with mine. It won't switch off with the card inserted and when I try to open anything that uses the card - music or camera apps - they won't start. Remove the card and everything is fine but a 4Gb phone is all but useless to me. The main reason I chose the 8S was because of the expandable storage.

I have a 8GB sd card, and when I insert in into the phone, nothing happens.
One thing I've noticed, when I format the SD card on my PC using NTFS, then insert it back into the phone, the phone detects the card and says it must format it before I can use it.
Once the phone formats the card, the card is not longer detected.

I have been using both cards (official SanDisk) and Windows 8 gets its knickers in a twist while using an app accessing the memory card (media player/photos) causing the app to crash. Rebooting the phone ends up with the SD card not being recognised by the OS. My assumption is that there are config files in the card's root that become corrupted and thus make it invisible to the OS. I am fairly certain this is a Windows 8 issue as opposed to HTC and needs to be addressed. I'd guess that its not more common because most windows phones come with a usable amount of memory on the phone and don't rely/allow memory cards.

I don't want to re-format my phone tbh - not really a great solution.

It's a real shame as I love the OS (mostly), but I am thinking of going back to the iPhone where everything just works :(

My SD card in Windows Phone S8 working, but in the menu, it does not show me. Everytime when i put SD card in my phone, the phone show me, that is some problem with SD card (but card normally works in my computer, in another phone...). Can someone help me fix that problem with my SD card??

hi iv purchased this phone recently ..but have found storage is less ..iv bought a sd card for the phone but cant get it activated on th laptop to give my phone more storage ...iv gone to the shop for giudence but they keep telling me to sort it out on th laptop ..pleases can somebody guide me thankyou ....

hi iv purchased this phone recently ..but have found storage is less ..iv bought a sd card for the phone but cant get it activated on th laptop to give my phone more storage ...iv gone to the shop for giudence but they keep telling me to sort it out on th laptop ..pleases can somebody guide me thankyou ....

What do You mean by "activated on laptop" ? There's no need to activate anything.
Just put the card into the phone and do the factory reset. This should cause the phone to prepare the SD card to use.